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+/* $XFree86: xc/programs/Xserver/mi/mizerline.c,v 3.6 2001/08/06 20:51:20 dawes Exp $ */
+/***********************************************************
+
+Copyright 1987, 1998 The Open Group
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of The Open Group shall not be
+used in advertising or otherwise to promote the sale, use or other dealings
+in this Software without prior written authorization from The Open Group.
+
+
+Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
+
+ All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose and without fee is hereby granted,
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in
+supporting documentation, and that the name of Digital not be
+used in advertising or publicity pertaining to distribution of the
+software without specific, written prior permission.
+
+DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
+ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
+DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
+ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+SOFTWARE.
+
+******************************************************************/
+/* $Xorg: mizerline.c,v 1.4 2001/02/09 02:05:22 xorgcvs Exp $ */
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+#include <X11/X.h>
+
+#include "misc.h"
+#include "scrnintstr.h"
+#include "gcstruct.h"
+#include "windowstr.h"
+#include "pixmap.h"
+#include "mi.h"
+#include "miline.h"
+
+/* Draw lineSolid, fillStyle-independent zero width lines.
+ *
+ * Must keep X and Y coordinates in "ints" at least until after they're
+ * translated and clipped to accomodate CoordModePrevious lines with very
+ * large coordinates.
+ *
+ * Draws the same pixels regardless of sign(dx) or sign(dy).
+ *
+ * Ken Whaley
+ *
+ */
+
+/* largest positive value that can fit into a component of a point.
+ * Assumes that the point structure is {type x, y;} where type is
+ * a signed type.
+ */
+#define MAX_COORDINATE ((1 << (((sizeof(DDXPointRec) >> 1) << 3) - 1)) - 1)
+
+#define MI_OUTPUT_POINT(xx, yy)\
+{\
+ if ( !new_span && yy == current_y)\
+ {\
+ if (xx < spans->x)\
+ spans->x = xx;\
+ ++*widths;\
+ }\
+ else\
+ {\
+ ++Nspans;\
+ ++spans;\
+ ++widths;\
+ spans->x = xx;\
+ spans->y = yy;\
+ *widths = 1;\
+ current_y = yy;\
+ new_span = FALSE;\
+ }\
+}
+
+void
+miZeroLine(pDraw, pGC, mode, npt, pptInit)
+ DrawablePtr pDraw;
+ GCPtr pGC;
+ int mode; /* Origin or Previous */
+ int npt; /* number of points */
+ DDXPointPtr pptInit;
+{
+ int Nspans, current_y = 0;
+ DDXPointPtr ppt;
+ DDXPointPtr pspanInit, spans;
+ int *pwidthInit, *widths, list_len;
+ int xleft, ytop, xright, ybottom;
+ int new_x1, new_y1, new_x2, new_y2;
+ int x = 0, y = 0, x1, y1, x2, y2, xstart, ystart;
+ int oc1, oc2;
+ int result;
+ int pt1_clipped, pt2_clipped = 0;
+ Bool new_span;
+ int signdx, signdy;
+ int clipdx, clipdy;
+ int width, height;
+ int adx, ady;
+ int octant;
+ unsigned int bias = miGetZeroLineBias(pDraw->pScreen);
+ int e, e1, e2, e3; /* Bresenham error terms */
+ int length; /* length of lines == # of pixels on major axis */
+
+ xleft = pDraw->x;
+ ytop = pDraw->y;
+ xright = pDraw->x + pDraw->width - 1;
+ ybottom = pDraw->y + pDraw->height - 1;
+
+ if (!pGC->miTranslate)
+ {
+ /* do everything in drawable-relative coordinates */
+ xleft = 0;
+ ytop = 0;
+ xright -= pDraw->x;
+ ybottom -= pDraw->y;
+ }
+
+ /* it doesn't matter whether we're in drawable or screen coordinates,
+ * FillSpans simply cannot take starting coordinates outside of the
+ * range of a DDXPointRec component.
+ */
+ if (xright > MAX_COORDINATE)
+ xright = MAX_COORDINATE;
+ if (ybottom > MAX_COORDINATE)
+ ybottom = MAX_COORDINATE;
+
+ /* since we're clipping to the drawable's boundaries & coordinate
+ * space boundaries, we're guaranteed that the larger of width/height
+ * is the longest span we'll need to output
+ */
+ width = xright - xleft + 1;
+ height = ybottom - ytop + 1;
+ list_len = (height >= width) ? height : width;
+ pspanInit = (DDXPointPtr)ALLOCATE_LOCAL(list_len * sizeof(DDXPointRec));
+ pwidthInit = (int *)ALLOCATE_LOCAL(list_len * sizeof(int));
+ if (!pspanInit || !pwidthInit)
+ return;
+
+ Nspans = 0;
+ new_span = TRUE;
+ spans = pspanInit - 1;
+ widths = pwidthInit - 1;
+ ppt = pptInit;
+
+ xstart = ppt->x;
+ ystart = ppt->y;
+ if (pGC->miTranslate)
+ {
+ xstart += pDraw->x;
+ ystart += pDraw->y;
+ }
+
+ /* x2, y2, oc2 copied to x1, y1, oc1 at top of loop to simplify
+ * iteration logic
+ */
+ x2 = xstart;
+ y2 = ystart;
+ oc2 = 0;
+ MIOUTCODES(oc2, x2, y2, xleft, ytop, xright, ybottom);
+
+ while (--npt > 0)
+ {
+ if (Nspans > 0)
+ (*pGC->ops->FillSpans)(pDraw, pGC, Nspans, pspanInit,
+ pwidthInit, FALSE);
+ Nspans = 0;
+ new_span = TRUE;
+ spans = pspanInit - 1;
+ widths = pwidthInit - 1;
+
+ x1 = x2;
+ y1 = y2;
+ oc1 = oc2;
+ ++ppt;
+
+ x2 = ppt->x;
+ y2 = ppt->y;
+ if (pGC->miTranslate && (mode != CoordModePrevious))
+ {
+ x2 += pDraw->x;
+ y2 += pDraw->y;
+ }
+ else if (mode == CoordModePrevious)
+ {
+ x2 += x1;
+ y2 += y1;
+ }
+
+ oc2 = 0;
+ MIOUTCODES(oc2, x2, y2, xleft, ytop, xright, ybottom);
+
+ CalcLineDeltas(x1, y1, x2, y2, adx, ady, signdx, signdy, 1, 1, octant);
+
+ if (adx > ady)
+ {
+ e1 = ady << 1;
+ e2 = e1 - (adx << 1);
+ e = e1 - adx;
+ length = adx; /* don't draw endpoint in main loop */
+
+ FIXUP_ERROR(e, octant, bias);
+
+ new_x1 = x1;
+ new_y1 = y1;
+ new_x2 = x2;
+ new_y2 = y2;
+ pt1_clipped = 0;
+ pt2_clipped = 0;
+
+ if ((oc1 | oc2) != 0)
+ {
+ result = miZeroClipLine(xleft, ytop, xright, ybottom,
+ &new_x1, &new_y1, &new_x2, &new_y2,
+ adx, ady,
+ &pt1_clipped, &pt2_clipped,
+ octant, bias, oc1, oc2);
+ if (result == -1)
+ continue;
+
+ length = abs(new_x2 - new_x1);
+
+ /* if we've clipped the endpoint, always draw the full length
+ * of the segment, because then the capstyle doesn't matter
+ */
+ if (pt2_clipped)
+ length++;
+
+ if (pt1_clipped)
+ {
+ /* must calculate new error terms */
+ clipdx = abs(new_x1 - x1);
+ clipdy = abs(new_y1 - y1);
+ e += (clipdy * e2) + ((clipdx - clipdy) * e1);
+ }
+ }
+
+ /* draw the segment */
+
+ x = new_x1;
+ y = new_y1;
+
+ e3 = e2 - e1;
+ e = e - e1;
+
+ while (length--)
+ {
+ MI_OUTPUT_POINT(x, y);
+ e += e1;
+ if (e >= 0)
+ {
+ y += signdy;
+ e += e3;
+ }
+ x += signdx;
+ }
+ }
+ else /* Y major line */
+ {
+ e1 = adx << 1;
+ e2 = e1 - (ady << 1);
+ e = e1 - ady;
+ length = ady; /* don't draw endpoint in main loop */
+
+ SetYMajorOctant(octant);
+ FIXUP_ERROR(e, octant, bias);
+
+ new_x1 = x1;
+ new_y1 = y1;
+ new_x2 = x2;
+ new_y2 = y2;
+ pt1_clipped = 0;
+ pt2_clipped = 0;
+
+ if ((oc1 | oc2) != 0)
+ {
+ result = miZeroClipLine(xleft, ytop, xright, ybottom,
+ &new_x1, &new_y1, &new_x2, &new_y2,
+ adx, ady,
+ &pt1_clipped, &pt2_clipped,
+ octant, bias, oc1, oc2);
+ if (result == -1)
+ continue;
+
+ length = abs(new_y2 - new_y1);
+
+ /* if we've clipped the endpoint, always draw the full length
+ * of the segment, because then the capstyle doesn't matter
+ */
+ if (pt2_clipped)
+ length++;
+
+ if (pt1_clipped)
+ {
+ /* must calculate new error terms */
+ clipdx = abs(new_x1 - x1);
+ clipdy = abs(new_y1 - y1);
+ e += (clipdx * e2) + ((clipdy - clipdx) * e1);
+ }
+ }
+
+ /* draw the segment */
+
+ x = new_x1;
+ y = new_y1;
+
+ e3 = e2 - e1;
+ e = e - e1;
+
+ while (length--)
+ {
+ MI_OUTPUT_POINT(x, y);
+ e += e1;
+ if (e >= 0)
+ {
+ x += signdx;
+ e += e3;
+ }
+ y += signdy;
+ }
+ }
+ }
+
+ /* only do the capnotlast check on the last segment
+ * and only if the endpoint wasn't clipped. And then, if the last
+ * point is the same as the first point, do not draw it, unless the
+ * line is degenerate
+ */
+ if ( (! pt2_clipped) && (pGC->capStyle != CapNotLast) &&
+ (((xstart != x2) || (ystart != y2)) || (ppt == pptInit + 1)))
+ {
+ MI_OUTPUT_POINT(x, y);
+ }
+
+ if (Nspans > 0)
+ (*pGC->ops->FillSpans)(pDraw, pGC, Nspans, pspanInit,
+ pwidthInit, FALSE);
+
+ DEALLOCATE_LOCAL(pwidthInit);
+ DEALLOCATE_LOCAL(pspanInit);
+}
+
+void
+miZeroDashLine(dst, pgc, mode, nptInit, pptInit)
+DrawablePtr dst;
+GCPtr pgc;
+int mode;
+int nptInit; /* number of points in polyline */
+DDXPointRec *pptInit; /* points in the polyline */
+{
+ /* XXX kludge until real zero-width dash code is written */
+ pgc->lineWidth = 1;
+ miWideDash (dst, pgc, mode, nptInit, pptInit);
+ pgc->lineWidth = 0;
+}
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